<?php
/*
interface  abc{
    public function getA();
    public function getB();

}

class person implements abc{
    public function getA()
    {
        // TODO: Implement getA() method.
    }
    public function getB()
    {
        // TODO: Implement getB() method.
    }
}
*/

class A{
    public static function who(){
        echo __CLASS__;
    }
    public static function test()
    {
        self::who();
    }

}

class B extends  A{
    public static function who(){
        echo __CLASS__;
    }
}
B::test();

